(19)
(11) EP 2 179 902 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.01.2013 Bulletin 2013/05

(43) Date of publication A2:
28.04.2010 Bulletin 2010/17

(21) Application number: 09172451.8

(22) Date of filing: 07.10.2009
(51) International Patent Classification (IPC): 
B60T 11/30(2006.01)
B60T 17/22(2006.01)
 B60T 13/68(2006.01)
F15B 11/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 22.10.2008 US 256190

(71) Applicant: DEERE & COMPANY
Moline, Illinois 61265-8098 (US)

(72) Inventors:
  • Sommer, Mark S
    Cedar Falls, IA 50613 (US)
  • Roe, Phillip S
    Eldora, IA 50627 (US)
  • Eagles, Derek M
    Cedar Falls, IA 50613 (US)
  • Seeber, Paul R
    Hudson, IA 50643 (US)

(74) Representative: Dehnhardt, Florian Christopher 
John Deere GmbH & Co. KG Global Intellectual Property Services John-Deere-Straße 70
68163 Mannheim
68163 Mannheim (DE)

   


(54) System for bleeding a valve in a vehicle hydraulic system


(57) A system (10) for bleeding a valve in a vehicle hydraulic system including a hydraulic directional control valve (12), in particular a selective control valve, a main spool (18) for controlling communication between a pump (32), a hydraulic reservoir (28) and first and second work ports (48, 50). The main spool (18) is movable from a neutral position to an extend position and to a retract position. The main spool (18) is also movable to respective first and second bleed positions wherein the respective work port (48, 50) is communicated with the hydraulic reservoir (28) before the other work port (50, 48) is communicated with the pump (32).







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Search report